摘要
锌空气电池具有能量密度高、成本低及环保等优势,其空气电极的优劣对电池的输出性能起到决定性的作用。本研究采用一种新型的多孔钙钛矿氧化物La_(0.7)Sr(0.3)CoO_(3-δ)(LSC)作为陶瓷基底,负载银纳米颗粒作为催化剂,研究其作为锌空电池空气电极的性能。通过调整制备过程中造孔剂(淀粉)的含量,优选出性能最佳的Ag-LSC空气电极(阴极),与锌阳极组装成锌空气电池,进行电化学性能测试。结果表明,当LSC基底的孔隙率为~32%且银含量30 mg/cm~2时,制备的多孔陶瓷负载银阴极组装的锌空气电池功率密度最高(141 mW/cm~2)。在Ag-LSC空气电极表面涂一层聚四氟乙烯(PTFE)疏水材料后,锌空气电池的使用寿命得到显著延长。
Zinc-air battery has great advantages such as high energy density, low cost and environmentally friendliness. Air electrode plays an important role in electrochemical performance of a zinc-air battery. In this paper, we report our study of a novel air electrode on which a porous perovskite ceramic La_(0.7)Sr(0.3)CoO_(3-δ)(LSC) with Ag nanoparticles directly grown. The porous LSC is used as substrate while Ag as catalyst. The porous structure of substrate attributes to the amount and dispersion of Ag nanoparticles which affect the electrochemical performance of air electrode. Therefore, the property of the Ag-LSC electrode is optimized by adjusting the mass content of pore-former(starch). Experimental results show that the Ag-LSC electrode, with a porosity of ~32% and a Ag load of ~30 mg/cm~2, exhibits the best performance in all tested samples, and a zinc-air battery assembled with such air electrode gives the maximum power density of 141 m W/cm. What's more, in order to ensure the gas diffusion channels, the hydrophilicity and hydrophobicity of the cathode is modified with PTFE to prevent flooding. After all that, the life-time of the zinc-air battery, with optimization by coating a PTFE layer as hydrophobic agent on the surface of the selected Ag-LSC electrode, prolongs significantly.
引文
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